Trimming mechanism for sewing machines



[March 20, 1928, 1,663,491

J. BERGER TRIMMING MECHANISM FOR SEWING'MACHINES Filed Feb. 25, 1926 2 Sheets-Sheet 1 March 20, 1928.

' J. BERGER TRIMMING MECHANISM FOR SEWING MACHINES Filed Feb 25. 1926 2 Sheets-Sheet Patented Mar. 20, 1928.

UNITED STA ES [PATENT OFFLCE.

JOSEIH BERGER, =01 "UTICA, NEW YORK,

ASSIGNOR TO onion srncrar. macnrnn COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

TRIMMING MECHANISM FOR SEWING MACHINES.

Application fi led February 25, -1926.- Serial No. 90,605.

Figure lis a view partly in front elevation andpartly in section showing a portion of a sewing machine with my improved trimming mechanism unit applied thereto;

Fig. 2 is a sectional view on the line 22 of ig- 1;

Fig. 3 is a perspective view of the unit supporting means detached from the machine, also showing the cover plate which is attached thereto, and

Fig. leis a view partly in plan and partly in section of the machine immediately above the throat plate and the trimming mechanism unit. I

In mycopending application Serial No. 729,100, .filed 'July'30, 1924, I have shown, described and claimed in detailethe trimming mechanism which is present in this application. The :present invention is directed'to the .unit mounting of the parts of the trimming mechanismon the bed plate of the machine, so that it can be-adjusted' toward and from the stitching mechanism. The sewing machine to which the invention is applied consists of a needle 1, an under thread carrying looper 2, and an overedgethread carrying looper 3. These stitching elements cooperate to form overedgest-itches. The material is fed-to thestitching mechanism by feed dogs 4: which operate through slots in a throat plate 5. This throat plate 5 is rigidly secured a to an upstanding member 6 carried by abed plate 7. The throatplate is secured by screws 8, 8 tothis upstanding member 6.

The trimming mechanism consists of a stationary trimming blade 9 and a movable trimming blade 10. This movable trimming blade 10 is carried by a bracket arm 11 fixed to a shaft 12. The shaft 12 is mounted in a bracket 13. Said bracket 13 is provided with 9. depending tenon or rib 1 1 which is adapted to engage a similarly shaped groove 15 formed inthe bed plate 7 of the machine (see Fig. .2). Said bracket13 is secured to the bed plate by bolts 16, 16. These bolts '16, 16 pass througl'i elongated slots 17, 17, respectively. The slots 17'are formed in the bed plate, and the bolts are passed upt-hrough these slots in the bed plate and are threaded into the b1'acket13. The clamping plate 1.8 is provided, through which both of t-he'bolts pass, and. this clamping plate is drawn tightly against the under faceof the bed plate. I i a The shaft 12 carrying the bracket arm 11 supporting the movable trimming blade is moved endwise and'to the left-as viewed in Fig. 1, by the spring 19. l The shaft is rocked by an arm 20 to which is connected a liiik 21. The bracket 13 is provided with spaced sleeves 22; 22 and the shaft 12 is located in these spaced sleeves. The arm 20 is secured to the shaftbetween the sleeves 22 1.22, and there issufiicient play :to permit a limited endwise movement of the shaft 152 through the action of the spring 19.

Secured to one end of the bracket 13 is an upstanding post 23. :'This upstanding'post engages the under face of the throat plate 5. Said throat plate is provided with a slot 24' through which a screw 25 passes. The purpose. ofthe slot is topermit-the post to be adjusted with thebracket 18. The stati0nnary -blade9 oi the trimming mechanism is mounted on this post'28. Thepost 28 is setrimming blade are mounted. This unit support is capable of adjustment toward and from the needle in a direction at right angles to the line of feed. This adjustmentrcan be readily accomplished by looscningthe bolts 16, 16,,and alsothe screw 25. l Jhen these parts are loosened, then the entire trimming mechanism may be shifted as a unit toward and from the needle. The purpose of the ad.- justment is to vary the width of the edge of the fabric which is covered by the overseaming stitches. It will be noted that the trimming mechanism is carried by a unit support which is mounted on the bed plate of the machine, and therefore, the entire trimming mechanism has a rigid durable supporting means which can be readily shifted as noted above, for varying the width of the edge which is covered by overseaming stitches.

The cover plate 27 is provided with a deflector 27 which rests against the supporting ledge 27 when the-cover plate is closed, This positions the deflector relative to the trimming devices so that the trimmed off strip is deflected back toward the front of the machine and away from the stitching mechanism. Inasmuch as the cover plate is mounted on the unit supporting bracket 13 which carries the trimming members, it will readily be seen that when the trimming device is adjusted toward and from the needle of the stitching mechanism, the strip defiector is adjusted therewith.

While I have described the trimming mechanism as used in conjunction with an overseaming stitching mechanism, it will be understood that it may be used in connection with any character of stitching mechanism where it is desired to trim the edge of the material a given distance from the line of stitching.

It is obvious that minor changes in the details of construction may be made without departing from the spirit of the invention as set forth in the appended claims.

Having thus described the inventiomwhat I claim as new and desire to secure by Letters Patent, is i 1. In a sewing machine, the combination of a bed plate, a throat plate, stitch forming mechanism including a needle, trimming mechanism including upper and lower trimming members, and means for supporting said trimming members including a bracket on which said members are mounted, means for connecting said bracket to the bed plate so that said bracket can be adjusted for varying the position of the trimming mechanism relative to the needle and means for supporting one end of said throat plate on said bracket.

2. In a sewing machine, the combination of a bed plate, athroat plate, stitching mechanism including a needle, upper and lower trimming members, a bracket adjustably attached to the bed plate and capable of being adjusted toward and from the needle, an upstanding post carried by the bracket on which is mounted said lower trimming member, said post being adjustably secured to the throat plate, and means whereby said on which said stationary trimming member is mounted, means for adjustably securing said bracket to said bed plate, and means for adjustably securing said post to said throat plate whereby said trimming mechanism as a unit may be adjusted toward and from the needle.

4. In a sewing machine, the combination of a bed plate, a throat plate, stitching mechanism including a needle, trimming mechanism including an upper movable trimming member and a lower stationary trimming member, a shaft carrying said upper movable member, abracket in which said shaft is mounted, a post secured to said bracket on which said stationary trimming member is mounted, means for adjustably securing said bracket to said bed plate, means for adjustably securing said post to said throat plate whereby said trimming mechanism as a unit may be adjusted toward and from the needle, said adjustable connection between the bed plate and the bracket including a rib on said bracket, a groove in said bed plate in which said rib fits, said bed plate having slots beneath said rib and groove, and bolts adapted to be passed up through said slots and threaded into said bracket for holding the bracket in adjusted positions.

5. In a sewing machine, the combination of a bed plate, stitch forming mechanism including a needle, trimming mechanism including upper and lower trimming members, means for supporting said trimming members whereby the same may be adjusted toward and from the stitching mechanism as a unit for varying the position of the trimming mechanism relative to the needle, a deflector hingedly mounted on said means for supporting the trimming members for deflecting the trimmed ofl strip, said deflector being adjustable with the trimming mechanism as a unit and capable of swinging to give access to the stitch forming mechanism.

In testimony whereof, I aflix my signature.

JOSEPH BERGER. 

